世界的眼泪是恒定的。每当一个人开始哭泣,另一个地方就有人停止哭泣。笑声也是如此。
The tears of the world are a constant quantity. For each one who begins to weep, somewhere else another stops. The same is true of the laugh.
The coal industry must evolve or risk becoming obsolete. Adaptation is the key to survival.
对天资在中等程度以上的人,可以和他谈论高深的学问;而对于中等以下天资的人,则不可以和他谈论高深的学问。